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Optical klystron experiments for the ACO storage ring Free Electron Laser |
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| Authors: | D A G Deacon M Billardon P Elleaume J M Ortega K E Robinson C Bazin M Bergher M Velghe J M J Madey Y Petroff |
| Institution: | (1) L.U.R.E., L.P. CNRS 008, Université de Paris-Sud, Bâtiment 209-C, F-91405 Orsay, France;(2) Present address: Deacon Research, 754 Duncardine Way, 94087 Sunnyvale, CA, USA;(3) Present address: Ecole Supérieure de Physique et Chimie, 10, rue Vauquelin, F-75231 Paris Cedex 05, France;(4) Present address: Départment de Physico-Chimie, Service de Photophysique, CEN Saclay, F-91191 Gif-sur-Yvette, France;(5) Present address: High Energy Physics Laboratory, Stanford University, 94305 Stanford, CA, USA;(6) Present address: Laboratoire de Photophysique Moléculaire, Université de Paris-Sud, Bâtiment 213, F-91405 Orsay, France |
| Abstract: | To improve the gain in the Orsay storage ring Free Electron Laser (FEL) experiment, the 17 period permanent magnet undulator has been modified to form an optical klystron (OK). We report the measurement of spontaneous emission and the effects on it of energy spread and angular spread. Gain and laser induced bunch lengthening measurements with the OK are also reported and are in very good agreement with the FEL classical theory. The spontaneous emission spectrum which is easy to measure with good signal to noise ratio, turns out to be a very good diagnostic tool forenergy spread and angular spread measurements on storage rings. The factor of four increase in the small gain obtained by converting the undulator NOEL into an OK was the critical factor in the recent operation of the ACO storage ring laser above threshold. |
| Keywords: | 42 60 42 55 |
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